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wheel lug pattern help

Discussion in 'The Hokey Ass Message Board' started by 1951fordf100, Dec 10, 2009.

  1. 1951fordf100
    Joined: Oct 27, 2007
    Posts: 45

    1951fordf100
    Member
    from Idaho

    I'm going to be picking up a '52 cadillac, was told the wheel pattern is 5 on 5. So I go to two different yards looking for rollers so I can move the car. Everything I measure seems to be 5 on 4 3/4. The guy at one yard pulls out his cheat sheet wheel disc thingy sets it on the wheel and it lines up perfectly 5 on 5. But when I measure it, it reads 5 on 4 3/4. About then a buddy calls says he has a set of 5 on 4 3/4. I get there, the wheel is marked 5 on 4 3/4 but when I measure it, it reads 5 on 4 1/2. Am I missing something here? I thought center to center is the measurement. Seems like center to center minus a 1/4 is the actual measurement. Any advice?
     
  2. Crankhole
    Joined: Apr 7, 2005
    Posts: 2,626

    Crankhole
    Member

    far side of one whole to center of opposite hole
     
  3. Scarebird
    Joined: Sep 26, 2006
    Posts: 908

    Scarebird
    Alliance Vendor
    from ABQ, USA

    Caddy's that vintage are 5 on 5" for reference.
     
  4. Da Tinman
    Joined: Dec 29, 2005
    Posts: 4,227

    Da Tinman
    Member

    Measured edge to edge the pattern will be off by 1/4", edge to center is what you need, and I'm being redundant!!
     

  5. 50's merc, Most Buicks into the 70's..(Full size), Caddy's, 60's-70's Lincoln, Chevy Vans and Trucks 5 lug, and Astro Vans are 5 x5.
    Some 70's tbirds too.
     
    Last edited: Dec 11, 2009
  6. find a 73' + chevy 1/2 ton truck they are 5 on 5" wheels.
     
  7. 5x5" wheels that will fit:

    Buick, Pontiac, Olds, Cadillac all through '60; all full size through '76; all BOP and Chevy wagons through '89; all Chevy and GMC 1/2 ton 2WD pickups and vans (5-lug wheels) '72-up. I've heard that Astro Vans are also 5x5 but never measured.

    Some '77-up full-size 2drs and sedans have 5x5 wheels and some don't, you need a model chart to know which; and 71-76 Chevy fullsize go to the 5x5 pattern. And cars like Chevelle, LeMans, etc. are not "full size" in the 1960s and 1970s sense of the word.


    The only thing I don't know is if the Caddy uses bolts or has studs and nuts. Cars that use bolts (Buick through at least '58) have locating pins on the drum with corresponding holes in the rims. The pins can be knocked off in a pinch.


    I should add: If you measure from center of hole to center of hole across the middle on a 5x5 you get 5x4 3/4. If you measure center of hole straight across to the other side (between holes) you'll get the 5x5 measurement. I had that mixed up for like 20 years.
     
  8. HotRodFreak
    Joined: Mar 25, 2005
    Posts: 1,935

    HotRodFreak
    Member

    Easier to measure edge to edge, then add 1/4".
     
  9. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,306

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    Yes, you are missing something here.......when a wheel bolt pattern is given....as in "5 on 5"....it means 5 bolts on a 5" diameter circle. When measuring an odd number, such as 5, from one wheel stud to one "across" from it..........it isn't DIRECTLY across, it's somewhat diagonal, and therefore, less than the actual diameter. A diameter must be measured by passing through the very center. On four or six lug wheels measuring 'across' passes through the center and is the true diameter.
     
  10. Redder
    Joined: May 30, 2012
    Posts: 4

    Redder
    Member

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